Telegraphy.



P. B. DELANY.

TELEGRAPHY.

APPLICA'HON HLED DEC-21. l9l6.

Patented Oct. 30, 1917.

2 SHEETS-SHEET l.

P. B. DELANY.

TELEGRAPHY.

APPLICATION FILED 050.21. 19m.

1,244,477. Patented 00th 30,1917.

2 SHEETS-SHEET 2.

Befit knownthat I, PATRICK 13..DELANY,

transmitted. v a

The principal object fof the present in- 3o dinarily employed and sopositionedin g" relation to the general. public that s gnals recordedthereby predo'minatefin i 011 mdiIIsO im F a 1 AYfurther object 'otmyinvention is to ovide a safeguarding sounder o tlthe 'naturereferred towhich shall recordreversals iof the signalsrecorded bythe Inainreceivinginstruments.

i a In the accompanying drawings,

E lis a diagrammatic View illustrating; one I "form ofj'niv invention. a

Fig. 2 is a'diagrammatic view ofaslightly modified formr,thereo t. Q a iFig. 3 "s a diagrammatic-view "of a furherljnodification. y v

i Fig. dis-a diagrammatidview of amec anically operated sounder. l

3:15 is a perspective vlewshowing a ossiblearrangement of instruments. I

Withsystems now in [use for receiving egraphicniessages within hearingof the nerallfpublic, such asin branch oflicesof tels, ,otfice buildingsandflthe like, it is coinbaratively easy for an outsider who has 5 aknowledge of telegraphyfto get within hearing fdistance of, thereceiving instru- 1 merits and read the message bein'g. transmit- 45;teder receivedat sucho'fiice. While the'disadvantages of such publicityhave long been recognized, it has, so far as I know,'neyer en lgr emed eexam by st li th i 1 flstrunients in a separate room. It often happensthat due to the limited Space provided it is almost impossible tosetjaside "stems ordinarily eniployed, and j to fmethod offlreceivingthe signalsor messages nt'ion is to provide a safeguarding soundermerits. a

dness verfthe signals recorded by'the h room. It is the purp osedof'the;p 'resvention to overcome these ob ect1ons mate large? extent thekl alsa STATES "PATENT OFFICE.

PATRiCK BQij LA Y, or some c imes, 'NEw JERSEY, ASSIGNOR o sEcRE'rTELEGRAPH COMPANY, OF NEW YOBK, N,Y., A CORPORATION or DELAWARE.

i V TELEGRAP i i Specification. of Letters lP atent. l Pfijjnfed'OQig,30, 191 7; Appl i cati orifiled Deceniber 27,"1e1e, s em. 139,103. i

supposedly private messages; Thisisaceompli'shed by providingwhat may betermed a supplemental or safeguarding sounder for use in connection withthe main receiving Sounders or instruments now in use, and placed;within hearing distance of the public, and controlling the operationthereof either from s'uch'infstrunients, or by independent mechanicallyoperated devices. This may be successfully done by causing thevibratingmernber of the safeguarding sounder to record. signalsconflicting with the signals received by; the main] instru- Referringnow more particularly to Fig. 1 of the drawings, Ihave shown a relay Rin circuit with the line wires Land adapted to controlthe operation ofthe main receiving instrument or soundens in the usual manner. Vith themain line circuit open, which is the conditioniwhich exists just priorto' thetransniitting of a message, the

armature '1 of the relay will bejdra'wn by the spring 2 into whatisnormallyits in]- operatlve position, whichposition is indicated in fulllines in the drawing. In the present system advantage is taken of thisposition forcontrolling the actuation of the supplemental orsafeguarding SounderfSS in the manner hereinafter described. .Upon

theclosing of the" sending key, the relay will hefe'nergized therebyattracting its, ar-

fmatur'e, against the action of the retaining spr1ng,intoelectrlcalcontact with the point 4. This will in turn close the localcircuit of the sounder S from the point 4, through the wire 5 to thesounder, and thence from the Wire 6 and battery B to the relay armaturethrough'the wire7., This causes the v armature 21of the sounder to beattracted in the usual mannerfor recording the "signal transmitted. Uponthe opening of thesending key, the relay armaturewill again resume thefull line'position,fthereby closing the circuit through contact 8, wire9 and switch 10 to the safeguard lng sounder, the

opposite side' of the circuit being completed through thef wir'e 11 andbattery B as "before described. ltkwill thus be seen that upon itsbackrs'trokelthe relay armature line lsounder,ithe ,circuit[ of which isclosed "closes the loealflcircuitoif thevsafeguarding sounder. therebycausnigithe "same (to give reversals of theslgnalsireceived by the maindis bin onin eri' 11 11622 Lbfthe sounder armaqlli entlyvo'f'thbprati'on, of 1th instance provided with 'a 'bufi'er jorubfittonof 70 v While I have illustrated the preferred jmanner of carrying outthe foregoing obgjects, it .Will be apparent that changes may be made incircuits and connections illus- 1 trated Without departing from thespirit of C the invention and scope of the appended claims. 1 U

i What, I claim is ,1. A system for protecting the secrecy of ingsounder, a safeguarding sounder, and

telegraphic messages, comprising a receivmeans for causing saidsafeguarding sounder to give telegraphic reversals of the signals receved by thereceivmg sounder.

1 A system for theprotection of telegraphic messages,-comprisingreceiving instruments mcluding a relay and a teleigraphicsoundercontrolled thereby, and a messages, comprising receivinginstruments including a telegraphic sounder, and a relay having anarmature controlling the opera- 2 5 tion of said sounder upon movementin.

safeguarding telegraphic sounder controlled 2 0116x016 said receivinginstruments.

"A system for protecting telegraphic one direction, a safeguardingtelegraphic sounder, and means for operating said safeguarding sounderupon movement of the relay armature in the other direction.

comed c! this patent may be obtained {or 4. A'system forprotecting thesecrecy of a telegraphic message, comprising a receiv-' ing station,;aprivate operators sounder at said station, and a public safeguardingsounder, both of said sounders being adapt- "edlto produce telegraphicsignals through- V out the time said message is being received.

producing a series of signals similar in nature to but interfering insound with the signals comprising said message to confuse a bystanderattempting to read the same.

In testimony whereof, I- have hereunto subscribed my name.

A PATRICK B. DELANY.

five cents each, by addressing the Commissioner of Patents, Washington.D. G."

